Monoazo dyestuff and process of making same.



UNITED STATES PATENT OFFICE.

Human wnenna AND zrosnr saline, or HocH's'r-oN-rnE-MAIN, Germain, AS- smuons 'ro rnanwnm VORM. 'MEIS'I'ER Luc us & alumina, or nocns'r-on- THE MAIN. GERMANY, A oonrona'rmn or GERMANY MONOAZO DYESTUEF -AND PROCESSOF MAKING SAME.

No Drawing.

I Specification of Letters Patent.

T 0 all whom; it may concern Be it known-that we, HERMAN WAG- mm, Ph. D., chemist, and Josm ERBER, Ph. D., chemist, citizens of the Empire of Germany, residing at Hochst-on the-Main, Germany, have invented certain new and useful Improvements in Monoazo Dyestufi's and Processes of Making Same, of which the following is a specification.

We have found that by combining the diazo compound from lmaphthylami'n-Q- sulfonic acid with 2-naphthol-3-carboxylic acid, a dyestufi is obtained, of which the magnesium-, manganese, strontium-, and

barlmn-salts, and particularly the calciumsalt, are remarkable for their beautiful violettint and are also of excellent fastness.

The manufacture of the new dyestuff and the new color lakes respectively'may'be conducted, for instance, as follows: The diazo compound produced in the usual manner from 245 kilos of sodium 1 :Q-naphthylaminsulfonate is run into an aqueous solution obtained from 190 kilos of 2-naphthol-3-carboxyli'c acid dissolved in 380 kilos of caustic soda-lye of 40 Baum specific gravity and Patented Feb. 6, 1912. Annlication filed June 1, 1911. Serial No.-630,580.

water while adding Turkey-red oil, and

into this mass there is-run an aqueous solution of the required quantity of'the salt which is to form the color-lake, for instance about 80 kilos of calcium chlorid. The mass is then heated until the reaction is terminated. Of course, the formation of the dyestuff and its transformation into the lake can be effected by a single operation.

Having now described our invention, what We claim is:

1. The herein described process ofmanufacturing a monoazo dyestufi especially suitable for preparing violet color-lakes,

. which consists in combining l-diazonaphthalene-2-sulfonic acid with 2-naphthol-3-carboxylic acid.

2. As a new product, the dyestufli' obtained by combining 1 diazonaphthalene 2 $111-- fonic acid with 2-naphthol-3-carboxylic acid, being a dark-red powder insoluble in alcohol, the aqueous solution ofgwhich is of a red color and its solution in concentrated sulfuric acid of a Violet-blue color, the free acid of the dyestuif separating from the latter solution on addition of Water in the form of a blue precipitate.

In testimony whereof, we affix our signatures in presence of two witnesses.

HERMANN WAGNER. JOSEF ERBER. Witnesses:

JEAN GRUND, CARL Group. 

